Paper-making machine



28 l,781,9 H; LIE'BECK m CH ER MAKING MA 18, 193 PAP Nov.

8 '7. 192 Filed Sept. 2

nvemor L /aback. Harry 6 or the machine in Patented Nov. 18, 1930 UNITEDSTATES PATENT orncr:

HARRY LIEBECK, OF SWARTHMORE, PENNSYLVANIA, ASSIGNOR 1'0 SCOTT PAPERCOMPANY, A CORPORATION OF PENNSYLVANIA PAPER-MARIN G MACHINE Applicationfiled September 27, 1928. Serial No. 808,698.

The object of my invention is to provide means for use in a F ourdriniermachine to maintain the fibrous paper stock floating above the wireapron at the breast roll end such a sutfici'ency of water that everyopportunit shall be given for the fibers of the stock to liecomearranged in interlocking relation to impart increased strength to thepaper transversely or in direction of the width of the web over what ispossible with machines of this class as heretofore constructed.

It is known that when paper making machines are run at a relatively highspeed, the tendency is to cause the stock fibers to largely lielongitudinally of the web, and where the web is of a lightweight grade,as in the case of toilet or tissue papers, the quantity of fiber issmall and the tendency to tear in the direction of the length of the webis pronounced; and to reduce this defect the tube rolls and wire apronmust be violently shaken in a transverse direction with an endeavor tocause a sufiicient quantity of the fibers to assume a transverseposition. This attempt is uncertain and costly and imposes great wearand tear upon the machine.

One of the principal causes of inefliciency in such attempts is due tothe lack of sufficient water above the wire apron at the breast roll endof the machine where the paper stock is supplied to'the apron. Toinsurea sufficient body of fluid would necessitate too much stock beingfed from the head box, as well as too much longitudinal flow and toogreat a speed of flow over the apron; consequently, mere adjustments offlow and shaking have not proved effective in overcoming thediflieulties.

My invention compreheuds additions to the table and tube rolls of aFourdrinier machine, which shall secure the following benefits: Meansare provided transversely in the table and between the tube rollsthereof, which shall, to a large extent, damthe free flow of thewaterthrough the wire apron and between the tube rolls; ranged below theapron and upper level of the tube rolls to prevent the upward return ofwaste water (which has drained through and additional means are-arandbelow the apron), again to the apron by the rotating tube rolls. Whileit is most desirable to retain a large body of stock charged wire apron,it is not desirable to return water which has been depleted of its fiberstock, since such return will dilute the thin stock to an objectionabledegree. My improvements function to restrict the flow of water from thestock through the apron between the table rolls and to prevent thereturn of water (which has passed from the apron) by the rotation of thetable rolls, with the result that I am enabled to build up above theapron, at the breast end of the fourdrinier, a depth of full strengthpulp, the stock fibers of which are free to adjust themselvestransversely shaking manipulation of the table and wire, as usuallycarried on.

y invention will be better understood by reference to the drawings, inwhich Fig. l isa longitudinal vertical sectional View of the end of aFourdrinier paper making machine illustrating the arrangement of thetable rolls and wire apron adjacent to the breast roll and head box end,the same embodying my improvements; and Fig, 2 is a perspective view ofa portion of Fig. 1, and illustrates my improvements.

2 represents the breast end of the wire apron of a Fourdrinier machine,3 is the breast roll, 4 is the head-box, and 5 is the shoe for supplyingthe paper pulp from the head-box to the apron above the breast roll.These parts may be constructed in the usual manner.

6 represents the tube or table rolls which extend, as usua transverselyof the table and wire apron, they directly supporting the apron duringits travel. rolls are positioned so as port the apron 2, but the theaxesof adjacent rolls is to properly supdistance between so great that thewater of the paper pulp flowing above. the

apron may freely pass through the interstices of the woven wire andthuscause the fibrous pulp above the apron to be so quickly depleted offluid that the fibers do not have the proper opportunity to readjustthemselves transversely in the normal operaunder reasonable Usually, thetube tion of the machine, and consequently the general arrangement ofthe fibers of the paper pulp 1s longltudinal of the web and the apronupon which it is formed. 10 represents one of the deckle straps or bandswhich are employed to form traveling sides to the apron and confine thepaper pulp to insure the web of paper being of a predetermined width.

All of the parts so far described are common to paper making machines,but cooperate with my improvements to secure the advantages hereinbeforeenumerated.

I arrange transversely of the table and parallel to the tube rolls aplurality of plates 7, each plate supported on the level of theunderside of the apron and in a plane common to the tops of all of thetube rolls, and said plates positioned between-each pair of tube rolls.In this manner, the wire apron 2 is supported not only by the tube rollsbut by the plates 7 intermediate of them, and moreover, the width ofthese plates 7 is such that they largely close the space below the apronand intermediate of the rolls and this is assured by bevelling the underedges of the plates adjacent to the rolls, so that water cannot freelyflow'through and away from the apron.

In practice, I prefer to form the plates 7 of hard rubber, vulcanite,bakelite, or other material providing a hard smooth surface over whichthe wire apron may travel without excessive wear either to the wire orto the plates. These plates 7 may be supported in any suitable mannerupon the table orframe in which the tube rolls are journaled, so thatsaid plates maintain their definite relations to the tube rolls duringthe shale ing of the table with the normal operation of the machine.

A suitable manner of supporting the transverse plates 7 is shown morefully in Fig. 2, in which said plates are secured to the upper flangesof light rolled beams 8 of T cross section, the said transverse beamsbeing secured at their ends to the sides of the shaking table andforming, as it were, a part of said table.

Notwithstanding that the plates 7 form a closure to a large extent tothe wire apron between two adjacent tube rolls, there is, nevertheless,space for the downward passage of some water through the apron, and asthis water will flow downward upon the roll itself, the rapid rotarymotion of said roll will have a tendency to carry the water around withit and throw said water upward on the rising side, so as to tend toreturn more or less of said water to the apron. To prevent this action,I provide a transverse plate 9 at the rising side of the rolls andacting, ina measure, as a scraper for interfering with the upward flowof the water with the roll and causing it to be dislodged and transverseplate may be of very light sheet material and bent in angle shape incross sec tion, the flange of the same being bolted to the vertical webof the T shaped transverse beam 8, heretofore referred to. It is notdesirable that this scraper 9 shall touch the tube roll, but it may bepositioned sufiiciently close thereto that the main body of water being.carried upward by the roll will be thrown against the edge of the saidscraper plate and 'prevent it from passing upward. By these twoadjuncts, namely, the plate 7 and, the scraper 9, the normal paper pulpabove the wire apron is prevented from becoming too quickly depleted ofits water, and secondly, such water as may pass through the screen andthereby filtered of its fiber is prevented from being returned to dilutethe pulp. in this manner, I am enabled to hold a sufficient depth ofpulp flowing above the wire apron adjacent to the breast roll, wherebyunder the shaking action of the table, the fibers of said pulp will haveevery opportunity to readjust themselves relatively to each other withinthe water body.

It will be understood that the flow of paper pulp from the head-box tothe apron is adjusted to maintain the desired level above the apron tocompensate for any water which escapes through the apron, but thismaintenance of a relatively deep body of paper pulp above the apron isonly desired at the breast end of the fourdrinier, and consequently theend of the machine approaching the couch rolls and distant from thebreast roll may be constructed in the ordinary manner withoutthe use ofmy improved transverse closure plates 7, thisbeing indicated by the lackof these plates at the left hand portion of Fig. 1.

The invention, therefore, consists more particularly in the provision ofthe transverse closure plates or tables 7 placed between the tube rollsto control the flow of water or drainage. prolonging it as desired,according to the relative positions of the tube rolls, and sooperatii'ig that the water and stock constituting the pulp are fedontothe wire apron and held there, as it were, until the readjustment ofthe fibers of the paper to be formed is completed.

It will now be apparent that I have devised a novel and usefulconstruction which embodies the features of advantage enumerated asdesirable, and while I have in the present instance shown and describedthe preferred embodiment thereof which has been found in practice togive satisfactory and reliable results, it to be understod that I do notrestrict myself to the details as the same are susceptible ofmodification in various particulars, without departing from the spiritor SCTiEO of the invention.

aving now described my invention, what I claim and desire secure byLetters Patent 1. In apaper makin machine of the Fourdrinier type, the com ination with a wire apron, t'ube rolls, press roll and head-box,-with a plurality of transversel arranged closure plates intermediate ofjacent tube rolls to provide obstruction to th How of water through theapron and downward betweenv the tube rolls, said closure plates formedof nonmetallic material. and upon which the apron is supported and 'ded,and transversely arran d metallic g i mes sustained at their emf; andformin an intermediate support for the nonm'eta 'c closure plates.

2. The invention accordin to claim 1,

wherein further, the non-meta c sup rtin plates are arrangedintermediate ofthe table rolls and are respectively provided withdeflecting plates adjacent to the upwardly travelling-surface of thetable rolls and extending toward but out of contact with the "tablerolls' whereb water centri thrown upward by t e table rolls will bedeflected away from the closure plates.

3.v In a paper making machine of the Fourdrinier type, the combinationwith a wire apron, tube rolls, press roll and head-box, with a pluralityof transversely arr closure plates intermediate of adjacent tu rolls toprovide obstruction to the flow of water drinier type, the com throu hvthe apron and downward between the tu e rolls, said closure plateshaving their upper surfaces on a le'vel with the tops of the tube rollsand havin their forward and rear edges bevelled on t eir undersides toform bevelled edges fitting over the adjacent tube rolls, and saidclosure plates further provided with transverse supportin means arrangedunder them intermediate 0 the tube rolls and sustained at their oppositeends.

4. In a paper makingml'achine of the Fourination with a wire apron, tuberolls, press roll and head-box,

' with a plurality of transversely arranged closure plates intermediateof adjacent tube rolls to provide obstructionto the flow of waterthrough the apron and 'downwardbetween the tube rolls, and su portingplates arranged between the tubero and supported at their V oppositeends, said supporting platesfurther provided with deflecting platesadjacent to the upwardly travelling surface of the table rolls andextending toward but out of contact with the table rolls, whereby watercentrifugally thrown upward by the table rolls will be deflected awayfrom the closure lates.

In testimony of which invention, hereunto set my hand. HARRY: LIEBEQK.

